Arc-lamp.



0. A. ROSS.

ABO LAMP.

LPPLIOATIOI rnnn In 20,1902.

999340. 1116111111 Aug. 1, 1911.

UNITED STATES PATENT OFFICE.

OSCAR A. BOSS, OFCHIGAGO, ILLINOIS, ASSIGNOR, 'BY MESNE ASSIGNMENT S, TALBERT H. HEADS, OF CHICAGO, ILLINOIS.

ARC-LAMP.

Specification of Letters Patent.

999,340. Patented Aug. 1, 1911.

Application filed Kay 29, 1902. Serial No. 109,450.

To all whom it-moy concern: coil R by wire 7'. The other end of thecoil,

Be it known that I, OSCAR A. Boss, a cititogether with one terminal ofsolenoid-S, is zen of the United States, residing at Chiwired to thenegative lamp terminal N. cago, in the county of Cook and State of -Thene ative electrode B is connected with Illinois, .have invented'certainnew and usesolenoi S by wire 6. The operating parts ful Improvements inArc-Lamps, of which are shown in theosition they would assume thefollowing is a full, clear, and exact .de: at th instant be ore the arcis full drawn. scri tion. The guides G are insulated from t e frame T isinvention relates to electric'lamps of of the lamp and are securedat'the bottom to 10 the arc type, and especially to that class opaninsulated support E, and at the top to erated from a constant potentialgenerator. yoke Y, also insu ated. -No feeding mecha- The object of theinvention isto provide a nism. is necessary for the negative electrodenew and improved lam of this description.- in this type of lamppreferabl'an inclosed My invention is fullyillustrated in the arc. The frame,supports, inc osing globe,. .15 accompanying drawing, wherein: -etc.,are of ordinary construction andneed Figure 1 represents a partsectional front not be here described. v elevation of the operative'parts of my iiril The operation is as follows: When current provedlamp; Fig. 2 a side view of the is admitted to the lamp, the electrodesbesame; F ig. 3 is a sectional view taken on ing in contact, it passesbywire to holder 20 line w:c of Fig. 1, and Fig. 4 is a plan view H,-thence' throu' h --both electro es and by of the carbon holder. j wireI; to solenoi S and to the negative ter- Like letters refer to likeparts in each. minal' N. The armature a is thus drawn up, A representsthe positive carbon or eleclifting one end ofclutch G at 8?. The weighttrode, partly broken away to show the operof the clutch holds the other,or free end, 25 ative mechanism. down, tilting the clutch until thepositive B is the negative electrode. carbon is -gr1 ped by the wallssurrounding S is a solenoid of ordinary type, provided openin c. l heelectrode and clutch are with armature s, and connecting link 8', bythen l i ed by the upward pull of :armature means of which latter themovements of the a'until the lugs 0' strike the upper ends of armatureare transmitted to the clutch C, slots g. =The upward'moveme'ntbeingthus through the pin a. The clutch has .a circuchecked,-theforcestill exerted by solenoid S. lar opening 0, through which thepositive tendsto further tilt the clutch on lugs c, carbon feeds. Thelugs c, on the sides of whichhatthat point constitute the pivotal theclutch C, work in slots g, milled in the center of the clutch. Thepositive-electrode 85 carbon guide rods G. The link '8' is prois thusfirmly held by a force exerted vided with a curved lug .9 which, bystrikequally on its oppositesids. In the positlon ing upon the upperface of the clutch serves described, an abnormal-increase of current toprevent it from falling below a horizon 'in solenoid S simpl results inippingelec tal position when released by solenoid S, trodeA-more fir ywithout lfti-ng 1t fur- 40 and pins 0' are at the bottom of slots 9'..ther and rupture of the are by excessive en- The holder H for thepositive carbon is comergization of the solenoid is in this manner posedof two halves h, It held together by a prevented; and the electrode willbe mainspring 71., the ends of which entga e pins h tained in this itionuntil the current secured in the two members 0 t e carbon strength hasso iminished that the weight 45 holder. This-carbon holder slides inguide of the various parts serves to overcome the rods G. Its bevelededge It is shaped to fit tractive force of the solenoid. In practiceseat j of contact piece J, and prevent this condition does not occur,except when further downwa rd movement of the positive there is apractical cessation of current. electrode A, when it has been nearlyconthis weight is comparatively small, it is ev1-- 50 sumed. The lampterminals are represented dent that a very considerable diminutlon of 1at P and N by the usual signs and A line current may be felt before theclutch 'flexible cord p, connects the positive termireleases thepositive electrode. When the. r al with carbon holder H, enabling thecaradjacent ends of the electrodes have been hon to feed withouthindrance. Contact sujiiciently consumed to cause the arc to 55 piece Jis connected to one end of resistance break, the interruption. of thecircuit theretofore maintained between the lamp terminals demagnetizessolenoid S, allowing its armature, the clutch and the positive electrodeto fall until contact is restored between the electrodes, when the arcwill again be established in the manner before described. Thisintermittent feeding of the lamp will continue at long intervals untilthe positive electrode is consumed to the point where the face h ofholder H impinges upon seat j of the contact piece J. The downwardmovement of said electrode being thus checked, the circuit will bebroken between the electrodes and the current shunted from contact Jthrough'wire j and resistance R to the negative terminal N. As thisresistance is practicallyequal in ohmic value to that of the establishedarc K, the equilibrium of the circuit is preserved and the other lampsthereon operate as usual. Whenever the clutch is released by solenoid S,should its free end fail to fall as rapidly as the opposite one, for anycause, the lug s will strike the upper surface of the clutch, forcingthe free end down and causing the clutch to assume a practicallyhorizontal position from which the next upward stroke of the solenoidwill cause the clutch to promptly grip and raise the carbon in themanner heretofore described. My present invention prevents the rupturingand restoring of the arc while the lamp is operating.

Generally speaking, my invention comprehends a form of clutch calculatedto strike an arc of a given length and to preserve the are by lockingthe positive carbon firmly at that point, so that it may be maintainedirrespective of currentvariations or jarring and shaking of the lampwith occasional feeding, until the electrodes are nearly consumed, whenthe operating parts are shortcircuited in a simple and novel manner, aresistance being automatically introduced at that time, to retain aconstant current in the circuit. The means of retaining the electrodesin the same vertical line is also a feature of my invention.

Carbon electrodes commonly used in arc lamps frequently vary slightlyfrom their stated diameter. As the length of the arc eeaaao 'vention andis an important improvement on the mechanism of arc lamps with which Iam, familiar.

. Having described my invention, I claim 1 An arc lamp comprisingparallel rods, an electrode associated therewith, a holder for saidelectrode formed of two parts, a

device within said parts adaptedto hold them together.

2. An arc lamp comprising an electromagnet, two electrodes, a ringclutch, a support therefor, a trunnion connection between said clutchand support in the plane of the upper electrode, a movable partcontrolled by the electromagnet, a pivotal connection between said partand one end of the clutch, and a stop device on said movable part forengaging the end of the clutch under predetermined conditions.

3. An arc lamp comprising an electrode,

two parallel rods by which it is guided, a

clutch pivotally connected atone end to said parallel rods in-the planeof said electrode, and an electromagnetic device associated with theother end of said clutch so as to vary its position. v

4:. An ELIC lamp comprising an electrode, two' substantially parallelrods between which said electrode is located, a clutchprovided withprojections which enter elongated slots in said rods, and anelectromagnet' connected with said clutch.

lln witness whereof, ltsubscnbe myslgnature, in presence of twowitnesses.

OSCAR A. ROSS.

Witnesses:

VVM. H. CLARKE, WALTER PoULsoN.

